Semileptonic and nonleptonic weak decays of Λb0

2018/03/04 by Jie Zhu, Zheng-Tao Wei, Hong-Wei Ke
Physics and Astronomy · #Algorithm #Baryon #Charmed baryons #Diquark #Factorization #High-Energy Particle Collisions Research #Lambda #Lepton #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Pseudoscalar meson #QCD sum rules #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Quark model #Quarkonium #Semileptonic decay #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevd.99.054020

published as Phys. Rev. D 99, 054020 (2019) · 66 pages, 6 figures

arxiv created 2018/03/04 · openalex created_date 2018/03/29 · openalex publication_date 2019/03/25 · arxiv updated 2019/04/03 · openalex updated_date 2026/08/05

Abstract

The recent experimental developments require a more precise theoretical study of weak decays of heavy baryon \mathrm\ensuremathΛ_b⁰. In this work, we provide an updated and systematic analysis of both the semi-leptonic and nonleptonic decays of \mathrm\ensuremathΛ_b⁰ into baryons \mathrm\ensuremathΛ_c⁺, \mathrm\ensuremathΛ, p, and n. The diquark approximation is adopted so that the methods developed in the B meson system can be extended into the baryon system. The baryon-to-baryon transition form factors are calculated in the framework of a covariant light-front quark model. The form factors f₃, g₃ can be extracted and are found to be non-negligible. The semileptonic processes of \mathrm\ensuremathΛ_b⁰\ensuremath→\mathrm\ensuremathΛ_c⁺(p)l^\ensuremath-\ensuremathν_l are calculated and the results are consistent with the experiment. We study the nonleptonic processes within the QCD factorization approach. The decay amplitudes are calculated at the next-to-leading order in strong coupling constant \ensuremathα_s. We calculate the nonleptonic decays of \mathrm\ensuremathΛ_b⁰ into a baryon and a s-wave meson (pseudoscalar or vector) including 44 processes in total. The branching ratios and direct CP asymmetries are predicted. The numerical results are compared to the experimental data and those in the other theoretical approaches. Our results show validity of the diquark approximation and application of QCD factorization approach into the heavy baryon system.

Citations

• Diquarks andΛb→Λcweak decays
• Anatomy of the perturbative QCD approach to the baryonic decaysΛb→pπ,pK
• Measurements of DirectCP-Violating Asymmetries in Charmless Decays of Bottom Baryons
• QCD factorization in B→πK, ππ decays and extraction of Wolfenstein parameters
• Heavy-to-light form factors on the light cone
• Diquarks and Exotic Spectroscopy
• QCD Factorization forB→ππDecays: Strong Phases andCPViolation in the Heavy Quark Limit
• Imaging Dynamical Chiral-Symmetry Breaking: Pion Wave Function on the Light Front
• QCD factorization for exclusive non-leptonic B-meson decays: general arguments and the case of heavy–light final states
• The decay of Λ _b→ p~K^- Λ b → p K - in QCD factorization approach
• Heavy baryonic Λb→Λη(′) decays
• Review of Multibody Charm Analyses